Influence of 5 at.%Al-Additions on the FCC to BCC Phase Transformation in CrFeNi Concentrated Alloys

2021 ◽  
Author(s):  
X. Zuo ◽  
A. Miotti Bettanini ◽  
A. Hilhorst ◽  
P. J. Jacques ◽  
N. Moelans
Keyword(s):  
Phase Transformation ◽  
Al Additions ◽  
Bcc Phase

scholarly journals Nucleation mechanism for hcp→bcc phase transformation in shock-compressed Zr

2020 ◽  
Vol 101 (14) ◽  
Author(s):  
Hongxiang Zong ◽  
Ping He ◽  
Xiangdong Ding ◽  
Graeme J. Ackland
Keyword(s):  
Phase Transformation ◽  
Nucleation Mechanism ◽  
Bcc Phase

In-Situ Observations on Interphase Boundary Migration and Grain Growth during α/γ Phase Transformation in Iron Alloys

2004 ◽  
Vol 467-470 ◽  
pp. 819-824 ◽  
Author(s):  
Tadao Watanabe ◽  
Kouichi Obara ◽  
Sadahiro Tsurekawa
Keyword(s):  
Phase Transformation ◽  
Grain Growth ◽  
Boundary Migration ◽  
Triple Junctions ◽  
Nucleation Sites ◽  
Interphase Boundaries ◽  
In Situ Observations ◽  
Bcc Phase ◽  
New Phase

In-situ observations of a/g phase transformation were made to study the effect of grain boundary microstructure of the generation of a new phase and the migration of a/g interphase boundaries in an Iron-4.2at.%Cr alloy. It was found that triple junctions with more random boundaries could be the primary nucleation sites, while triple junctions with low angle and low S coincidence boundaries did not play a role as preferential sites. The migration of a/g interphase boundaries during heating across the transformation temperature showed the two stage behaviour characterized first by a stage with a migration velocity of 0.33-0.75µm/s and secondly a stage with 3.7-7.6 µm/s. It was also found that abnormal grain growth and a high density of S3 coincidence boundaries could occur in the a/bcc phase after cycling of a/g/ a phase transformation.

The FCC to BCC phase transformation kinetics in an Al0.5CoCrFeNi high entropy alloy

2017 ◽  
Vol 710 ◽  
pp. 144-150 ◽  
Author(s):  
Jun Wang ◽  
Sizhe Niu ◽  
Tong Guo ◽  
Hongchao Kou ◽  
Jinshan Li
Keyword(s):  
Phase Transformation ◽  
High Entropy Alloy ◽  
Transformation Kinetics ◽  
High Entropy ◽  
Phase Transformation Kinetics ◽  
Bcc Phase

Bcc / B2 phase equilibria and phase transformation from B2 to β’ in refractory Nb-X(Pd, Rh, Ir)-Al

MRS Advances ◽  
2017 ◽  
Vol 2 (25) ◽  
pp. 1335-1340
Author(s):  
T. Yamanouchi ◽  
S. Miura ◽  
M. Ohno ◽  
K. Ikeda
Keyword(s):  
Solid Solution ◽  
Phase Transformation ◽  
Surface Layer ◽  
Phase Field ◽  
Composition Range ◽  
Eutectic Temperature ◽  
Two Phase ◽  
Wide Composition Range ◽  
B2 Phase ◽  
Bcc Phase

ABSTRACTFor the improvement of oxidation resistance of Nb-based alloys, PdAl-B2 is expected as Al reservoir for Al2O3 surface layer because it is in equilibrium with Nbss (bcc) phase. However, PdAl forms cracks during casting caused by B2 -> β’ transformation. To suppress B2 -> β’ transformation, Rh, Ru and Ir were chosen as additive elements. It is found that bcc / B2 two-phase field in Nb-Pd-Ir-Al system is limited to be small fraction of Ir, while (Pd,Rh)Al-B2 is in equilibrium with bcc solid solution in a wide composition range and addition of Rh prevents occurrence of B2 -> β’ transformation. Composition range of (Pd,Ru)Al-B2 in equilibrium with bcc phase is wider than (Pd,Ir)Al-B2 but narrower than (Pd,Rh)Al-B2. Rh and Ru addition are also beneficial for improving eutectic temperature of Nb-bcc / B2 aluminide two-phase alloys.

scholarly journals Titanium’s high-temperature elastic constants through the hcp–bcc phase transformation

2004 ◽  
Vol 52 (7) ◽  
pp. 2075-2080 ◽  
Author(s):  
Hirotsugu Ogi ◽  
Satoshi Kai ◽  
Hassel Ledbetter ◽  
Ryuichi Tarumi ◽  
Masahiko Hirao ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Elastic Constants ◽  
Bcc Phase
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